Automatic brake for weaving looms



' A. GAULARD AUTOMATIC BRAKE FOR WEAVING LOOMS Nov. 8, 1927.

Filed May 22. 1926 Pen t "I Patented Nov. 8, 1927.

ALFRED GAULARD, OF PARIS, FRANCE, Assienon, 'ro ATELIERS DES c 4 runs, FRANCE, A CORPORATION OE FRANCE.

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U'roMA'r-Io BRAKE EOE wEAvmG LO'OMS.

Application filed May 22, 1926, Serial No.

v The present invention relates to an auto- :matic brake for weaving looms obviating all attention of the weaver when the loom isstarted or stopped, orwhen themachine sis inoperative and the loom is. to be operated by. hand, for unweaving or like purposes. I

For this purpose the brake, the object of the invention, is essentially characterized in lo thatwhen the loom is stopped by the unwhich is actuated, to stop the machine,

either by hand or by any one of the supplemental mechanisms such as the Weft stop motion, the warp stop-motion, the automatic continuous weft feeding device or the like. v r

The following description with reference to the appended drawings which are given by way of example, relates to a form of construction of my said automatic brake. V

Fig. 1 is a side elevation of the apparatus, and Fig. 2 is the corresponding front elevation.

1V is thebrake wheel or drum, coacti11g with the leather faced brake shoe, 2, below vwhich is disposed, to assure the progressive action of the brake, an india rubber buffer which is slidable in the main body of the brake shoe; the said shoe is pivoted at 8 and iscontrolled, through suitable gear such as the rod 4:; the bell crank 5 and the rod 6, by the controlling lever 7 to which the rod is attached at 8.

The lever 7, which is actuated by the releasing devicerwhen it is disposed for uncoupling purposes in order to effect the momentary automatic braking and the auto matic brake release which immediately succeeds the braking, is pivoted to a stationary axle 9 mounted on the machine frame and is constantly urged by the spring 10 which applies it by its heel 11 against a stop 12, the said action being momentarily countercrank 5, or liketransmission gear.

110,851, and in France na as, 1925.

acted during the braking, the'lever being then raised by the displacement of the'expansion device and applying the brake by means of the .rods' l and -6 and the bell The ascent Ofthe lever 7.contrary to the action of the spring 10,-for braking, pur

formed on its lower edge, which, is raised for a certain time depending upon the movement of the releasing device for disengaging the brake, by means of an element secured-tothe said releasing device and herein consisting of a lever 14 which is pivoted, at 1 5 ,tothe vunclutching lever 16 and has at thellower poses, is effected by the cam portion 13 end'thc heel 17, said lever 14: being held stationary and raising by its upper end, 1'8the controlling lever 7v during the displacement of t the. releasing device for disengaging the brake, but yielding, during the movement of the releasing device in the other. direction, to the starting device.

The operation of the automatic brake is as follows: During the functioning of theloom, the unclutohing lever 16, having been moved at the start in the direction of the arrow a and dash lines at 16, will be displaced when actuated by hand or by a suitable brakereleasing device, in the direction contrary to the arrow, a, thus stopping the machine. During this displacement of the releasing lever, the lever 14 which is mountedthereon, will tend, when its upper end 18 m'akes contact with the cam 13, to pivot in the contrary direction to the arrow 1), but since and assuming the position shown in the dot it bears by its heel 17 against the releasing device .16, the pivoting movement will be prevented, so that'it will remain stationary, and this will cause by the action ofits upper end 18 upon the cam 13 the ascent of the controlling lever 7 against the antagonistic action of the spring 10, so that the shoe'Q, v

will be applied against the brake wheell,

affording a progressive braking by the action of the said shoe and the presence of the said india rubber buiier. 7

This braking action is only temporary, since it isfollowed by a release of the brake shoe when the end 18 of the lever 15 has passed beyond the lowest, point of; the cam 13 of the controlling lever Y, which again descends under the action of the spring 10,

thus releasing the brake shoe; the brake release being terminated Whenthe release de vice attains its extreme position (shown 111 the full lines at 16) and the end 18 ot' the lever 14 -1'e'a"ves"t'he cam 13bit the lever 7 57 which is applied bv'its'heel stop 12 and which through the rods 4 and 6 and the bell CIfillkf) diseii g a ges thefbrake shoe 2 to such a-degree that there Will be no more friction. 7

On the contr'ary,vvhen the ma'chiiieis in the 'i ioperativeposition and the said rel-eas- 'ingfdeviceis moved-fin the direction or the 'arrow a for braking purposes, 'thelever 14: will yield Wheniits upper end 18 makes c011 tact With the "cam 13: andwill' swing in the direction of the" arrow-b so that itwill not 1 'Inodi i'y the poiition of th 'a'-'l-ever 7 ;*the--1ever "14 will be 'broughtback, ai tencle'ai'ing the c'am*13,- bythewveight of'iits lieeljl7 whose 20 in thin 's' limited by'it's contactwith the reflel s 'z g' l'e'ver 16.

'Ob'vously v the 1 said fectfamomentar 'antonmtie braking 1 Ql."

lowed byen ai'iton iatiflbra ke"release which "-is imnied-I 'ely" consecutivefsaicl pivoted lever ngsuhjectedtetheconstant action in of a sprin whmh app'lies' it by means of a heel against a sto'p, and thus in a permanent "position in which it"liolds'the'brake "in the released icisitio'n', this constant action'oii the *s'priiig being momentarily counteracted duri5 ing thebrakiiig, the control lever 'beingthen actuated byan e'le'nient mounted on the resn' ingingauxiliary lever nlotrnted'tliereon; a "cam cooperating \vithsai'dbrake lever's'ysleasi ng 'device. v p Y 2. The disposition upon, the pivoted con- 7 troli lever controlling 'thebrake shoe and fio'subjec'tedto'the constant action of a'spr ing as referred toinclaimzl, in order to moi'nenmanly c'ountemct theefiee ofthe said spring *tdc'arry out the braking, "of a cam or projection Wl hlCh lS raised for a deteiniined'tiine I by'theeleinent inoun't'edbnthereleasing device*'during the displacement of'thereleasing device for uncoupling purposes. 7 a

* 3. The realization of thenionientary lifti'ng of the pivotedjlev er as referred'to in p "clainil having a. cam or projection, by means 11' a ainst the of the control lever and whose lovver end compr ses a heel, said lever, mounted on the releasing device, bearing against it by its 'fli'eel during the motion ofthe" re easing device when the uncoupling takes place, and raising the cainby its top end, and pivoting on the "contrary, during the motion of the releasing device-in the other direction, for starting the machine. "4: An automatic brake comprising a fi'riction drum rotative'fwith the loomnnec'hanism, a pivoted brake; shoe cooperating therewith, a lever and pull =ro'd system cooperating therewith, and havinga cam member, a clutch, operative between-the loom mechanism a power sourceand having an operating lever,- a swinging auxiliaryi'ever mounted thereon, a camcooperat- "111g with said "brake lever system and" said sv'vinging lever upon said clutch-"lever" Whereby movement oi said clutclr'l'ever' to'release the clutch, 'actua'te said -brake and vvhereby said swinging lever is relieved from said earn during the engaging"niotion of "said clutch lever. V 1 J 5. An automatic brake for weaving looms, comprising a brake drum and a brakeslioe having a ieatl-i'er face-and ane'lastic rubber "backing means.

6. Fin automatic brake forrwveaving looms, (JOIIlPi'lSlHg a friction" di'uin, a brake shoe cooperat'nig therewith, a leather face thereon,

and means comprising a rubber bufier'positioned Within a "back "recess "in the body oi bralre shoe cooperating with said' 'le ath'er 'i rictionsur face.

7. An automatic brake for Weaving looms,

loom mechanism, a pivoted bra ke'shoe c0- operating there'i'vith, having leather braking f'surfaee'and an-elastic rubber "backing n'ie'ans cooperating therewith, a; lever and pull rod system cooperating therewith, havtemand said swinging lever upon sa'id clutch to release-the clutch, actuat'e's said b'ra -ke' and whereby said swinging lever is relieved from *saidbam during the engaging mo tion of said clutch lever.

for Weaving-looms,

\ 8. An automatic brake for Weaving looms,

comprising'afifriction d'ri'iin, a brakeshoe, a cooperating pull rod ami iever brake rijgiging, a foam lever member therein, end a Weighted bell cranklevercooperating with said cam and attached to a lo'om actuating lever.

, ALFREDGAULARD. 

